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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20172m

Justify the statement “Stack computer consists of an operation code only with no address field”.

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Justification: Stack computer is zero-address machine; operands implicitly on top of stack (TOS). Instruction needs only opcode because addresses of operands are implied: e.g., ADD pops two top elements, adds, pushes result. No fields to specify registers/memory. Useful for expression evaluation (postfix). Trade-off: needs stack manipulation instructions.

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